Million instructions per second (MIPS) is a way of measuring how fast a computer can do things. It's like the speedometer in a car, which tells you how fast you're driving.
Instead of measuring how fast the computer is moving, MIPS measures how many different things the computer can do in a second. These things are called "instructions" and they are the basic building blocks of everything the computer does.
Think of a computer like a big puzzle. Each instruction is a little piece of that puzzle. And the more pieces the computer can put together in a second, the faster it is.
For example, if a computer has a MIPS rating of 1 million, it can put together 1 million pieces of the puzzle in a second. But if it has a MIPS rating of 500,000, it can only put together 500,000 pieces in a second.
So MIPS is an important way to measure how fast a computer is. The higher the MIPS rating, the faster the computer can go!